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  1. S

    Mathematics: Post your doubts here!

    for first question i drew the argand diagram but not able to find least value ... second question attached
  2. S

    Mathematics: Post your doubts here!

    Part (ii) of both questions . . . I know how to draw argand diagram , but cant figure out how to find K
  3. S

    SOLVED HARDEST questions for QUICK last day REVISION

    Are you doing A2 too ? If so , then do the samething fot A2 as well
  4. S

    Chemistry: Post your doubts here!

    Can someone tell me why 1- why they used 7.20 as pka in q 2c(iii) > http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w06_qp_4.pdf 2- Find %by mass of CU in question 2(c)...
  5. S

    Chemistry: Post your doubts here!

  6. S

    SOLVED HARDEST questions for QUICK last day REVISION

    He clearly mentioned this thread is not for posting doubts ? This is ONLY for solved papers :eek:
  7. S

    SOLVED HARDEST questions for QUICK last day REVISION

    midha.ch snowbrood daredevil XPFMember Astarstudent
  8. S

    Chemistry: Post your doubts here!

    I want the procedure :mad::p
  9. S

    Chemistry: Post your doubts here!

    paper5 : how you would measure the independent variable ( concentration of HCl ) markscheme says : "Dilutes a range of volumes of HCl" how ?
  10. S

    Mathematics: Post your doubts here!

  11. S

    Mathematics: Post your doubts here!

    :rolleyes:
  12. S

    Mathematics: Post your doubts here!

    question 9 Hope my doubts make you also benefit :p http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s10_qp_31.pdf part (i) i got till - 1 / {( 1-x) (1+x}^1/2 * 1 / (1+x)^2 , and its right but i cant simplify it part (ii) didnt know how to solve it
  13. S

    Mathematics: Post your doubts here!

    Got it , ! We assumed tan(A) = t so from our t value . we get theta as tan-1(t) > substitut value of t from itertion
  14. S

    Chemistry: Post your doubts here!

    But i didnt ask u :p
  15. S

    Chemistry: Post your doubts here!

    In on2006 paper 4 can some one tell me why they chose ph to be the pka ?
  16. S

    Chemistry: Post your doubts here!

    What you mean by no repetition ? do we join points by scale ?
  17. S

    Mathematics: Post your doubts here!

    q 10 i & iv http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s12_qp_31.pdf
  18. S

    Chemistry: Post your doubts here!

    Whats a smooth curve ?
  19. S

    Further Mathematics: Post your doubts here!

    There is nothing in the pic :p
  20. S

    Mathematics: Post your doubts here!

    I know this site , but it dont have hookes law
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